1. China inundation, flood will need helicopters ! China earthquake, slurry mobile, mud flow need helicopters!

2. Mud-flow and laharic tuffs Mud flows and lahars are catastrophic phenomena that may occur regularly at some locations, giving rise to important accumulations of poorly sorted sediments below volcanic slopes.

3. It can be shown that the theories on gas/solid two-phase flow developed for air and mist drilling and theories on liquid/gas two-phase flow developed for oil production through tubing are inaccurate when applied to Aerated mud flow in an annular